Jean J. Mathelus, driver of bus #91, the local to Nyack, prepares to leave the Spring Valley station stop, July 20, 2012. ( Tania Savayan / The Journal News )

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Rockland County officials are warning TOR and Tappan ZEExpress bus riders about possible delays and service disruptions when a new operator takes over Sunday.

Riders should expect some growing pains as Brega Transport Corp. assumes control of the buses from Coach USA, which operated them since 1976. At least 34 drivers will be new to the 11 bus routes, along with at least 52 drivers who have experience navigating them.